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hal.structure.identifierLaboratoire Bordelais de Recherche en Informatique [LaBRI]
hal.structure.identifierLaboratoire Photonique, Numérique et Nanosciences [LP2N]
hal.structure.identifierMelting the frontiers between Light, Shape and Matter [MANAO]
dc.contributor.authorBELCOUR, Laurent
hal.structure.identifierProgram of Computer Graphics [PCG]
dc.contributor.authorBALA, Kavita
hal.structure.identifierModels and Algorithms for Visualization and Rendering [MAVERICK]
dc.contributor.authorSOLER, Cyril
dc.date.accessioned2023-05-12T11:00:18Z
dc.date.available2023-05-12T11:00:18Z
dc.date.created2013-07-12
dc.date.issued2014-08-01
dc.identifier.issn0730-0301
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/182025
dc.description.abstractUne nouvelle analyse locale de la diffusion et de l'absorption de la lumière dans l'espace de Fourier est combinée avec le tracé de covariance et permet une estimation rapide du contenu fréquentiel local; cette approche permet l'amélioration de nombreux algorithmes de rendu de milieux participants tels que Progressive Photon Beams et l'integration d'effets de diffusion simple et l'échantillonnage et la reconstruction d'effets de simple diffusion simple en espace image.
dc.description.abstractEnRendering participating media requires significant computation, but the effect of volumetric scattering is often eventually smooth. This article proposes an innovative analysis of absorption and scattering of local light fields in the Fourier domain and derives the corresponding set of operators on the covariance matrix of the power spectrum of the light field. This analysis brings an efficient prediction tool for the behavior of light along a light path in participating media. We leverage this analysis to derive proper frequency prediction metrics in 3D by combining per-light path information in the volume.We demonstrate the use of these metrics to significantly improve the convergence of a variety of existing methods for the simulation of multiple scattering in participating media. First, we propose an efficient computation of second derivatives of the fluence, to be used in methods like irradiance caching. Second, we derive proper filters and adaptive sample densities for image-space adaptive sampling and reconstruction. Third, we propose an adaptive sampling for the integration of scattered illumination to the camera. Finally, we improve the convergence of progressive photon beams by predicting where the radius of light gathering can stop decreasing. Light paths in participating media can be very complex. Our key contribution is to show that analyzing local light fields in the Fourier domain reveals the consistency of illumination in such media and provides a set of simple and useful rules to be used to accelerate existing global illumination methods.
dc.description.sponsorshipAnalyse des opérateurs de transport lumineux et applications - ANR-11-BS02-0006
dc.language.isoen
dc.publisherAssociation for Computing Machinery
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.title.enA Local Frequency Analysis of Light Scattering and Absorption
dc.typeArticle de revue
dc.identifier.doi10.1145/2629490
dc.subject.halInformatique [cs]/Synthèse d'image et réalité virtuelle [cs.GR]
dc.subject.halMathématiques [math]/Analyse numérique [math.NA]
bordeaux.journalACM Transactions on Graphics
bordeaux.pageArticle No. 163
bordeaux.volume33
bordeaux.hal.laboratoriesLaboratoire Photonique, Numérique et Nanosciences (LP2N) - UMR 5298*
bordeaux.issue5
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionCNRS
bordeaux.peerReviewedoui
hal.identifierhal-00957242
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00957242v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=ACM%20Transactions%20on%20Graphics&rft.date=2014-08-01&rft.volume=33&rft.issue=5&rft.spage=Article%20No.%20163&rft.epage=Article%20No.%20163&rft.eissn=0730-0301&rft.issn=0730-0301&rft.au=BELCOUR,%20Laurent&BALA,%20Kavita&SOLER,%20Cyril&rft.genre=article


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